Types of Galaxies: Spiral, Elliptical, and Irregular Explained

Every galaxy you've ever seen a photo of falls into one of a small handful of basic shapes, a classification system astronomer Edwin Hubble...

What Is a Constellation? A Beginner’s Guide to the Sky’s 88 Star Patterns

A constellation is a group of stars that forms a recognizable pattern in the night sky, one we've given a name, usually after a mythological figure, animal, or object. There are 88 of them officially recognized, and together they map out the entire sky....

How Many Planets Are There? The Real Answer Is Bigger Than Eight

There are eight planets in our solar system: Mercury, Venus, Earth, Mars, Jupiter, Saturn,...

What Is a Galaxy? A Simple Guide to the Great Islands of Stars

A galaxy is an enormous collection of stars, gas, dust, and dark matter, all...

Our Neighboring Galaxy Is Slowing Down, and Nobody’s Quite Sure Why

Andromeda has been humanity's most-watched galaxy for over a century, close enough to spot...

Some Black Holes Might Be Older Than the Big Bang Itself

For almost a century, cosmologists have traced everything back to one single starting point....

How Far Is the Sun From Earth? The 93-Million-Mile Answer and Why It Keeps Changing

The Sun sits an average of about 93 million miles (150 million kilometers) from...

How Old Is the Universe? The 13.8-Billion-Year Answer and How We Measured It

The universe is about 13.8 billion years old. More precisely, 13.787 billion years, give...

How Hot Is the Sun? A Layer-by-Layer Look at Our Star’s Blistering Temperatures

How hot is the sun? It depends entirely on which part you mean. The core is a nuclear furnace running at around 15 million...

The Beginning to the End of the Universe: Will Black Holes Die?

Black holes have this reputation as the ultimate cosmic bullies. They swallow stars, rip...

What Is Uranus’s Distance from the Sun? The Complete Guide to the Ice Giant’s Orbit

When you look up at the night sky Uranus is totally invisible to the...

How Many Planets Are There? The Real Answer Is Bigger Than Eight

There are eight planets in our solar system: Mercury, Venus, Earth, Mars, Jupiter, Saturn,...

Galaxies & Deep Space

Supermoon: What It Really Is, Why It Happens, and When to Catch the Next One

A supermoon is a full moon that lines up with the Moon's closest approach...

What Is a Constellation? A Beginner’s Guide to the Sky’s 88 Star Patterns

A constellation is a group of stars that forms a recognizable pattern in the...

How Many Planets Are There? The Real Answer Is Bigger Than Eight

There are eight planets in our solar system: Mercury, Venus, Earth, Mars, Jupiter, Saturn,...

What Is a Galaxy? A Simple Guide to the Great Islands of Stars

A galaxy is an enormous collection of stars, gas, dust, and dark matter, all...

How Far Is the Sun From Earth? The 93-Million-Mile Answer and Why It Keeps Changing

The Sun sits an average of about 93 million miles (150 million kilometers) from...

Webb’s New Portrait of the Lion Nebula Just Dropped, and It’s Roaring

Five thousand light-years away, a dying star is carving a lion's face out of...

What Is Mercury Retrograde? The Real Astronomy Behind the Internet’s Favorite Excuse

Sooner or later, everyone hears it. A friend misses a flight, sends a text...

What the Apollo Moon Rocks Actually Told Us

One of the very first things Neil Armstrong did after climbing down the ladder...

What Happens When a Star Dies?

Stars look like they are permanent. They sit in the night sky year after...

The Farm Boy Who Built a Telescope Out of a Buick and Found a Planet

A hailstorm wrecked the Tombaugh family's Kansas crops in the 1920s, wiping out any...

The Black Hole That Was Never Supposed to Be Found

It was a Saturday in November 2025 when an algorithm flagged something strange in...

Cassini Has Been Gone for Eight Years. It’s Still Making Discoveries.

Cassini deliberately burned up in Saturn's atmosphere back in September 2017, ending its mission...

Astronomers Just Found a “Black Hole Star,” a Cosmic Object That Shouldn’t Exist

For years, the James Webb Space Telescope has been spotting mysterious, extremely bright red...

Liquid Nitrogen Is Flowing on Pluto: The First Sign of Recent Liquid on the Dwarf Planet’s Frozen Heart

Pluto sits so far from the Sun that sunlight takes more than five hours...

Planets

What Is a Pulsar? The Spinning Stellar Lighthouses of the Galaxy

In the summer of 1967, a 24 year old graduate student named Jocelyn Bell Burnell was combing through reams of paper printouts from a brand new radio telescope at Cambridge, hundreds of feet of data every single week, when she noticed something odd. A...

Mars Gravity Compared to Earth: What You’d Really Weigh on the Red Planet

Picture yourself stepping off a lander onto the rusty dust of Mars. First thing...

The Mars Rover’s Last Words: The True Story Behind “My Battery Is Low and It’s Getting Dark”

There's a line about a dying robot on Mars that has made grown people...

Why Do Stars Twinkle? The Simple Science Behind the Sky’s Sparkle

Here's the twist that surprises almost everyone: stars don't actually twinkle. Not really. The...

Why Is the Moon Orange Tonight: The Simple Science Behind a Glowing Red Moon

The Short Answer The Moon usually looks orange or red because it's sitting low on...

Space Missions

How to See the Milky Way From Earth: A Simple Guide to Spotting Our Galaxy With Your Own Eyes

There's a strange truth about the Milky Way. You live inside it, right now, along with every person who has ever existed, and yet...

What Is Geothermal Energy?

If you've ever wondered what is geothermal energy and how heat buried deep beneath...

How Far Is the Sun From Earth? The 93-Million-Mile Answer and Why It Keeps Changing

The Sun sits an average of about 93 million miles (150 million kilometers) from...

Why Does Uranus Rotate on Its Side Learn the Science Behind It

Ever thought a planet could just tip over? Our solar system looks like a predictable dance of spheres. But one world breaks the rules. Why Does Uranus Rotate on Its Side is a big mystery in astronomy. Most planets spin like tops, but Uranus spins...

What Would Happen If Earth Had Two Moons Explained

Imagine stepping outside on a crisp autumn evening. Look up and see a second glowing orb in the sky. For centuries, we've looked at...

Planet Earth

The Leo Constellation: How to Spot the Lion and the Backward Question Mark in Its Mane

Most constellations need a generous imagination to see the thing they're named after. Leo...

How Many Solar Systems Are in the Milky Way?

It's one of those questions that sounds simple until you actually try to answer...

The Photo Nobody at NASA Wanted to Take

By February 1990, Voyager 1 had already done its job. It had flown past...

Webb Just Found Water Surviving Right Next to Our Galaxy’s Black Hole

Half a light-year from Sagittarius A*, in a region bathed in some of the...

How Many Moons Does Saturn Have? The Number Keeps Climbing

If you learned your solar system facts in school anytime before the last couple of years, theres a good chance whatever number you memorized for Saturn's moons is now seriously out of date. This isn't one of those slow, gradual updates either, Saturn's moon...

All Articles

Some Black Holes Might Be Older Than the Big Bang Itself

For almost a century, cosmologists have traced everything back to one single starting point....

Jupiter: Size, Distance From the Sun, and Orbit

Jupiter took most of the leftover material from the Sun's own formation, ending up...

Webb Just Found Water Surviving Right Next to Our Galaxy’s Black Hole

Half a light-year from Sagittarius A*, in a region bathed in some of the...

Upcoming Meteor Showers: The Complete Rest-of-2026 Calendar

Six more meteor showers cross Earth's path before the year is out, and two...

Types of Galaxies: Spiral, Elliptical, and Irregular Explained

Every galaxy you've ever seen a photo of falls into one of a small...

What Is a Brown Dwarf? The Star That Never Quite Made It

Somewhere between a planet and a star sits a category of object that never...